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HelicopterScale Model RC Helicopters › OF head and blades - first impressions
03-29-2005 05:50 AM  13 years agoPost 1
seattle_helo

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Seattle, WA USA

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Got home from work today and found a couple of packages on the doorstep.

I know many folks here and elsewhere have already commented on the quality of the OF system but I was still awe struck as I unpackaged the parts and had a good long look at them. The head is quite simply a masterpiece. Fit, finish and precision is outstanding. The blades too are works of art. Very meaty, very straight and true and each one was balanced to at least .01g of each other. This stuff is well made, that's for sure.






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03-29-2005 05:55 AM  13 years agoPost 2
vetrider

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Daleville, AL (Ft.Rucker)

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Dr. Tim's 4 blade OF head is flying very nice. Only took about 4 moves to track all 4 blades with a black marker. Hard to reach over and touch the blade with Tim hovering though!

Nolan

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03-30-2005 12:45 AM  13 years agoPost 3
Dr.Tim

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Mojave Desert

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The 4 blade with 655mm blades sure floats a Benzin in for auto's!! Lots of energy and super stable!

From Simple minds come simple ideas! Approach Engineering

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03-30-2005 12:51 AM  13 years agoPost 4
seattle_helo

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Seattle, WA USA

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That comment about blade tracking reminds me: is it hard to track these multi blade set-ups? I have not been able to find any info online that addresses this.

Dr. Tim, how did you go about it exactly?

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03-30-2005 04:30 AM  13 years agoPost 5
vetrider

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Daleville, AL (Ft.Rucker)

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hehehe
Dr. Tim, how did you go about it exactly?
YEAH .. Dr Timmy, Tell um how we educated folks do it!

Actually we did it like they use to do a huey or most other helis before strobexes and such came out.

Tim got the heli light on the skids and I walked over and held a fat tipped black marker down SLOWLY into the rotor disk. Only the high blade will touch the marker. Fastest I could touch and remove the marker was 2 ticks. We did it 4 times and they were all in track.

Those too scared to do it keep your stupid negitive comments to yourself! I do stupid stuff for a living and your tax dollars pay for it.

Nolan

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03-30-2005 04:35 AM  13 years agoPost 6
Dr.Tim

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Mojave Desert

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Nolan said it all .......

Please be careful! Set your throttle hold to High Idle and bring the blades up to about 2 degrees positive .. not enough to fly it but just enough to load the blades. Touch the felt tip and adjust ... this is old school but then again I went to school in the Old days

From Simple minds come simple ideas! Approach Engineering

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03-30-2005 04:53 AM  13 years agoPost 7
vetrider

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Daleville, AL (Ft.Rucker)

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hehehe No beers. We get high on helicopters! I did think I was going to need a beer after I had to chase a sliding heli to mark a blade. I think Tim forgot to set the hold sw.

Nolan

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03-30-2005 04:54 AM  13 years agoPost 8
seattle_helo

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Seattle, WA USA

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hmmmm... Very interesting. Sounds like a simple and straightforward method. As long as you're ultra aware and cautious of everything around you it seems reasonably safe to do. Probably best with two people. I'm a long ways off from doing any blade tracking but I'll file this away for the future. Thanks guys.

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03-30-2005 05:09 AM  13 years agoPost 9
ComancheDriver

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Bothell, WA USA

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Know all about that 'ole school', we use this stuff in Army aviation for years tracking Hueys, Cobras and Kiowa and it still works today.

In the field you improvise then go home otherwise it get pretty cold in a cockpit at night.


Helicopter Pilots can keep it up longer..............

Helicopters have expiration dates. It just not printed anywhere on them.

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03-30-2005 06:29 AM  13 years agoPost 10
vetrider

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Daleville, AL (Ft.Rucker)

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In the field you improvise then go home otherwise it get pretty cold in a cockpit at night.
BBRRRRR

An aluminum box with too much ventilation!

Nolan

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03-30-2005 12:22 PM  13 years agoPost 11
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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i have always used the different color tips on each blade method and it works great for me especially as i am always by myself during tests and setups. i recently set up an of head and after adjusting all the rods to the exact same length using century's pushrod tool, the tracking was perfect. great tool and a head that was precise.

drive a rotary, fly a rotorcraft

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03-30-2005 05:12 PM  13 years agoPost 12
seattle_helo

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Seattle, WA USA

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Emile, I'm glad to hear that because I was hoping precise push rod calibration with calipers would be enough to get real close or even dead on from the get go. After thinking about it some more, I'm not so sure the marker method is the best one for me...

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03-30-2005 09:30 PM  13 years agoPost 13
vetrider

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Daleville, AL (Ft.Rucker)

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I was hoping precise push rod calibration with calipers would be enough to get real close or even dead on from the get go.
It was pretty close using a caliper on the push rods. With-in one turn on the blades marked.

Nolan

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04-01-2005 05:48 AM  13 years agoPost 14
Joel Rosenzweig

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Marlborough, MA - USA

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Using Calipers
I use digital calipers to measure the pushrod lengths and to help me make them equal. By making the rods the same length, the tracking has been perfect every time. I've not had to adjust a thing on any multi-bladed rotor head using this technique.

Joel-

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04-01-2005 06:04 AM  13 years agoPost 15
seattle_helo

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Seattle, WA USA

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Joel, would you mind listing the model number and manufacturer of the digi-calipers you have?

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04-01-2005 06:15 AM  13 years agoPost 16
Joel Rosenzweig

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Marlborough, MA - USA

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My caliper is made by "Fowler & NSK" and is called "MAX-CAL". It measures up to 6.0", english and metric units.

I purchased this unit in 1991 from Starret Tools, based in Athol, Massachusetts. I have no idea if this unit is still available, but similar units are readily available.

A good unit will be both accurate (give you repeatable measurements) and precise (have enough significant digits to have meaningful data). The more expensive units available will be more accurate. Most all digital calipers are exceedingly precise. However, precision without accuracy is not all that useful here. The cheaper calipers may tend to give you less repeatable measurements. If there is any play in the caliper, you'll know that it won't be good at giving you repeatable results. If the movement is smooth and solid, you'll know you are buying an instrument that is up to the job. That will be impossible to determine with a mail order purchase.. so, price can be somewhat of a guide.

Joel-

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04-01-2005 06:25 AM  13 years agoPost 17
seattle_helo

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Seattle, WA USA

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Thanks Joel!

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04-01-2005 05:37 PM  13 years agoPost 18
gonzalom

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Northern California

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I go the same method that Gregory described....... it works perfect or 99.9 % after that you go and fly.

Gonzalo

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04-19-2005 06:20 AM  13 years agoPost 19
seattle_helo

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Seattle, WA USA

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A small update. Today I received a scale rotor head cap for the OF head from the guys at Modellbau Bremer in Germany. I think it looks pretty nice:

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04-19-2005 12:27 PM  13 years agoPost 20
vetrider

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Daleville, AL (Ft.Rucker)

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I use digital calipers to measure the pushrod lengths and to help me make them equal. By making the rods the same length, the tracking has been perfect every time. I've not had to adjust a thing on any multi-bladed rotor head using this technique.
You got bad eyes! Just kidding.

I like Gregory's setup. I guess a pitch guage could be modified to hold the lazer and when set at "0" zero deg should work. hhhhmmmm

Nolan

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HelicopterScale Model RC Helicopters › OF head and blades - first impressions
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